Dell PowerEdge Systems Red Hat Enterprise Linux 8 Release Notes

PowerEdge servers with the AMD Rome processor fail to detect an NVMe drive after multiple hot plugs

Description

The PowerEdge servers with the AMD Rome processor fail to detect an NVMe drive after multiple hot plugs.

Cause

Issue in pciehp driver.

Workaround

NOTE:The output of each command varies based on your system configuration.

Follow the steps:

Identify the parent device to which the NVMe device is connected using the following command:
```
lspci -t

-+-[0000:e0]-+-00.0
|           +-00.2
|           +-01.0
|           +-02.0
|           +-03.0
|           +-03.1-[e2]----00.0
```
From the above snippet, the device e2:00.0 is the NVMe device and the device e0:03.1 is the parent device. The parent device is used for the steps that are described subsequently.
Read the Slot Status Register in the PCI Express Capability structure by running the following command:
```
setpci -s e0:03.1 CAP_EXP+0x1a.w
```
Output: 0148 (value returned)
Clear the event bits that are impacted by running the following command:
```
setpci -s e0:03.1 CAP_EXP+0x1a.w=0x0108
```
Re-read the Slot Status Register to confirm that event bits are cleared by running the following command:
```
setpci -s e0:03.1 CAP_EXP+0x1a.w
```
Output: 0040 (value returned)
Unplug the drive and then plug-in the drive after clearing the event bits.

Solution

The issue is resolved in Red Hat Enterprise Linux 8.2 z-stream kernel version kernel-4.18.0-193.13.2.el8_2.x86_64 and later

Systems affected

PowerEdge R6515, PowerEdge R7515, PowerEdge R6525, PowerEdge C6525, and PowerEdge R7525

Applies to

Red Hat Enterprise Linux 8

Tracking number

155501, 155503